Finding the Fourth Proportional to 123,997.78, 170,813.23 and 89,906.10

Step by Step Solution

1. Step 1: Write the proportion equation
   123,997.78 : 170,813.23 = 89,906.10 : x
2. Step 2: Convert to fraction form
   123,997.78/170,813.23 = 89,906.10/x
3. Step 3: Cross multiply
   123,997.78x = 170,813.23 × 89,906.10
4. Step 4: Simplify right side
   123,997.78x = 15,357,151,337.70
5. Step 5: Solve for x
   x = 15,357,151,337.70/123,997.78
6. Step 6: Final answer
   x = 123,850.21